50 lines
1.8 KiB
Diff
50 lines
1.8 KiB
Diff
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From 9fd0035ff518ab3d2d4ee2578176fb562f9eb161 Mon Sep 17 00:00:00 2001
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From: cmss_dx <dingxiang@cmss.chinamobile.com>
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Date: Wed, 23 Nov 2022 06:05:06 +0000
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Subject: [PATCH 06/29] gdb-xml: Fix size of EFER register on i386 architecture
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when debugged by GDB mainline inclusion from mainline-v7.2.0-rc2 commit
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75ac231c67cdb13f0609943fab5499963858b587 category: bugfix
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--------------------------------------------
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Before this commit, there were contradictory descriptions about size of EFER
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register.
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Line 113 says the size is 8 bytes.
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Line 129 says the size is 4 bytes.
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As a result, when GDB is debugging an OS running on QEMU, the GDB cannot
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read 'g' packets correctly. This 'g' packet transmits values of each
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registers of machine emulated by QEMU to GDB. QEMU, the packet sender,
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assign 4 bytes for EFER in 'g' packet based on the line 113.
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GDB, the packet receiver, extract 8 bytes for EFER in 'g' packet based on
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the line 129. Therefore, all registers located behind EFER in 'g' packet
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has been shifted 4 bytes in GDB.
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After this commit, GDB can read 'g' packets correctly.
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Signed-off-by: TaiseiIto <taisei1212@outlook.jp>
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Message-Id: <TY0PR0101MB4285F637209075C9F65FCDA6A4479@TY0PR0101MB4285.apcprd01.prod.exchangelabs.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: cmss_dx <dingxiang@cmss.chinamobile.com>
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---
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gdb-xml/i386-32bit.xml | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/gdb-xml/i386-32bit.xml b/gdb-xml/i386-32bit.xml
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index 872fcea9c2..7a66a02b67 100644
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--- a/gdb-xml/i386-32bit.xml
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+++ b/gdb-xml/i386-32bit.xml
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@@ -110,7 +110,7 @@
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<field name="PKE" start="22" end="22"/>
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</flags>
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- <flags id="i386_efer" size="8">
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+ <flags id="i386_efer" size="4">
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<field name="TCE" start="15" end="15"/>
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<field name="FFXSR" start="14" end="14"/>
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<field name="LMSLE" start="13" end="13"/>
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--
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2.27.0
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